linux-kernel - Re: [PATCH V2 0/3] watchdog: stm32: add dynamic prescaler support

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Date:   Thu, 2 May 2019 13:37:46 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Ludovic Barre <ludovic.Barre@...com>
Cc:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Rob Herring <robh+dt@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-watchdog@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 0/3] watchdog: stm32: add dynamic prescaler support

On Thu, May 02, 2019 at 04:08:43PM +0200, Ludovic Barre wrote:
> From: Ludovic Barre <ludovic.barre@...com>
> 
> This patch series updates stm32 watchdog driver on:
> -use devm_watchdog_register_device
> -Guenter's recommendation about return value:
> set_timeout return 0 on succes, -EINVAL for "parameter out of range"
> and -EIO for "could not write value to the watchdog".

No, sorry, that is not what I meant.

set_timeout() should set ->timeout either to the requested value
if equal to or larger than the maximum timeout supported by the
hardware, and to the actually selected timeout otherwise.

Guenter

> Set of reload and prescaler registers are stay in start function,
> because the stm32 watchdog must be enabled to write these registers.
> -adds dynamic prescaler support
> 
> Ludovic Barre (3):
>   watchdog: stm32: update to devm_watchdog_register_device
>   watchdog: stm32: update return values recommended by watchdog kernel
>     api
>   watchdog: stm32: add dynamic prescaler support
> 
>  drivers/watchdog/stm32_iwdg.c | 96 ++++++++++++++++++++++++-------------------
>  1 file changed, 54 insertions(+), 42 deletions(-)
> 
> -- 
> 2.7.4
>